WO2018116156A1 - Procédé et structure de gaufrage destinés à augmenter au maximum l'accumulation de pression lors du gaufrage rotatif de feuilles - Google Patents

Procédé et structure de gaufrage destinés à augmenter au maximum l'accumulation de pression lors du gaufrage rotatif de feuilles Download PDF

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Publication number
WO2018116156A1
WO2018116156A1 PCT/IB2017/058121 IB2017058121W WO2018116156A1 WO 2018116156 A1 WO2018116156 A1 WO 2018116156A1 IB 2017058121 W IB2017058121 W IB 2017058121W WO 2018116156 A1 WO2018116156 A1 WO 2018116156A1
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WO
WIPO (PCT)
Prior art keywords
roll
projections
positive
negative
embossing
Prior art date
Application number
PCT/IB2017/058121
Other languages
English (en)
Inventor
Charles Boegli
Werner Steffen
Original Assignee
Boegli-Gravures Sa
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Boegli-Gravures Sa filed Critical Boegli-Gravures Sa
Priority to CN201780086176.5A priority Critical patent/CN110290918B/zh
Priority to PL17826310T priority patent/PL3558659T3/pl
Priority to BR112019012566-3A priority patent/BR112019012566B1/pt
Priority to US16/470,624 priority patent/US11453190B2/en
Priority to RU2019121658A priority patent/RU2746061C2/ru
Priority to EP17826310.9A priority patent/EP3558659B1/fr
Publication of WO2018116156A1 publication Critical patent/WO2018116156A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31F—MECHANICAL WORKING OR DEFORMATION OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31F1/00—Mechanical deformation without removing material, e.g. in combination with laminating
    • B31F1/07—Embossing, i.e. producing impressions formed by locally deep-drawing, e.g. using rolls provided with complementary profiles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31F—MECHANICAL WORKING OR DEFORMATION OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31F2201/00—Mechanical deformation of paper or cardboard without removing material
    • B31F2201/07—Embossing
    • B31F2201/0707—Embossing by tools working continuously
    • B31F2201/0715—The tools being rollers
    • B31F2201/0717—Methods and means for forming the embossments
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31F—MECHANICAL WORKING OR DEFORMATION OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31F2201/00—Mechanical deformation of paper or cardboard without removing material
    • B31F2201/07—Embossing
    • B31F2201/0707—Embossing by tools working continuously
    • B31F2201/0715—The tools being rollers
    • B31F2201/0723—Characteristics of the rollers
    • B31F2201/0733—Pattern
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31F—MECHANICAL WORKING OR DEFORMATION OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31F2201/00—Mechanical deformation of paper or cardboard without removing material
    • B31F2201/07—Embossing
    • B31F2201/0707—Embossing by tools working continuously
    • B31F2201/0715—The tools being rollers
    • B31F2201/0723—Characteristics of the rollers
    • B31F2201/0738—Cross sectional profile of the embossments
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31F—MECHANICAL WORKING OR DEFORMATION OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31F2201/00—Mechanical deformation of paper or cardboard without removing material
    • B31F2201/07—Embossing
    • B31F2201/0707—Embossing by tools working continuously
    • B31F2201/0715—The tools being rollers
    • B31F2201/0741—Roller cooperating with a non-even counter roller
    • B31F2201/0743—Roller cooperating with a non-even counter roller having a matching profile
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31F—MECHANICAL WORKING OR DEFORMATION OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31F2201/00—Mechanical deformation of paper or cardboard without removing material
    • B31F2201/07—Embossing
    • B31F2201/0707—Embossing by tools working continuously
    • B31F2201/0715—The tools being rollers
    • B31F2201/0753—Roller supporting, positioning, driving means

Definitions

  • the invention is in the field of foil embossing. More particularly the invention relates to a method for making embossing rolls, and their use in a pair for embossing foils.
  • packaging foils may for example be so-called innerliners that are intended to be wrapped around a bunch of cigarettes, or to be used as packaging material for chocolate, butter or similar food products, as well as electronics, jewelry or watches.
  • the innerliners used to be made from pure aluminium foils, such as aluminium foils use in households. These foils were embossed by feeding them into a roll nip between a pair of rolls. At least one the rolls comprised a topographical structure that defined for example a logo. Until the 1980s such a pair of rolls would comprise mostly one steel roll on which a profile would be formed, and a counter roll made from a resilient material, e.g., rubber, paper or plexiglas.
  • the imprinting or embossing of the profile of the logo carrying roll, also called the pater roll, into the counter roll, also called the mater roll, would allow to obtain the mirror imprint of the logo in the foil.
  • pin up-pin up made it possible to produce a so-called satiniz- ing whereby a large number of small recesses produced by the teeth give to the surface a matt, velvet-like appearance—which incidently confers a more distinguished look to the embossed material.
  • Patent publication EP3038822 describes fine embossing for surface structures as described and mentionned herein above, and for various types of materials in an online process, whereby this encompasses figurative patterns and topographies.
  • fine embossing comprises that the outlines of fine embossing structures on the rolls have a total linear mistake of less than +/- 10 ⁇ and an angle error of less than 5°.
  • EP3038822 is adapted mostly for relatively restricted surfaces.
  • one aim of the invention is to provide a solution for fine embossing that allows to produce checkered-style and larger uniformly embossed areas in a step length of about 50 to 250 ⁇ .
  • An other aim is to provide a configuration which also reduces uncontrolable contraction in the axial direction while foils are being embossed.
  • a further aim is to provide a solution that allows to produce the fine embossing over areas in an homo- gene manner on the foil.
  • the invention provides an embossing method allowing to emboss a material on both sides.
  • the method comprises at least feeding the foil material into a roll nip between a pair of a first roll and a second roll, providing the first roll and the second roll each with a plurality of positive projections and a plurality of negative projections of identical shaped polyhedral structures, the positive projections are elevated above a mean cylindrical surface of their roll, and the negative projections are recesses reaching below the mean cylindrical surface of their roll, a first subset of the plurality of positive projections being disposed with a first periodicity on a first grid in axial direction and a second periodicity on the first grid in circumferential direction on the first roll, and a second subset of the plurality of negative projections being disposed with the first periodicity in axial direction and the second periodicity in circumferential direction on the first grid interwined with the positive projections, in axial and circumferential directions respectively, and a third subset of the plurality of
  • the method is characterized in that it further comprises disposing in the first grid the positive projections and the negative projections such that in the axial direction on the first roll each positive projection shares a lateral base border with at least one negative projection adjacent to the positive projection, where the first straight line (y-y) and the second straight line (x-x) are coincident in a single third line (z-z), and during the operation of the rolls and in the roll nip, all lateral oblique surfaces of the positive and negative projections of the first roll are just above the surface in full faced view with the corresponding lateral oblique surfaces of the respective negative and positive projections of the second roll, thereby enabling a homogeneous distribution of pressure to the material.
  • the first roll is a motor roll and the pair of rolls is configured such that the motor roll drives the second roll.
  • first roll and the second roll are synchronized by means of synchronization means.
  • the synchronization means comprise for each of the first roll and the second roll a teethed wheel, the teethed wheels cooperating to synchronize the first roll and the second roll during operation such that the teethed wheel of the first roll is connected with the teethed wheel of the second roll.
  • the synchronization means comprise the positive projections and negative projections of the first roll and the second roll, the positive projections and the negative projections cooperating to synchronize a rotation of the first roll and the second roll during the operation of the rolls.
  • the method further comprises providing at least one of the lateral oblique surfaces with shading structure means for producing through an intended embossing of the material an optical shading effect when light is projected o the embossed material.
  • the step of providing at least one of the lateral oblique surfaces with shading structure means comprises providing pilxelizing embossing structures.
  • the invention provides an embossing apparatus for embossing a material on both sides.
  • the apparatus comprises at least a pair of a first roll and a second roll configured to emboss the material which is intended to be fed into a roll nip formed by the first and the second roll, the first roll and the second roll being provided each with a plurality of positive projections (P) and a plurality of negative projections (N) of identical shaped polyhedral structures, the positive projections are elevated above a mean cylindrical surface of their roll, and the negative projections are recesses reaching below the mean cylindrical surface of their roll, a first subset of the plurality of positive projections being disposed with a first periodicity in axial direction on a first grid and in a second periodicity in circumferential direction on the first grid on the first roll, and a second subset of the plurality of negative projection being disposed with the first periodicity on the first grid and with the second periodicity in circumferential direction on the first grid interwined with the
  • the apparatus is characterized in that on the first roll and on the second roll a disposition of the positive projections and the negative projections is configured such that in the axial direction on the first roll each positive projection shares a lateral base border with at least one negative projection adjacent to the positive projection, where the first straight line (y-y) and the second straight line (x-x) are coincident in a single third line (z-z), and during an intended operation of the rolls and in the roll nip, all lateral oblique surfaces of the positive and negative projections of the first roll are just above the surface in full faced view with the corresponding lateral oblique surfaces of the respective negative and positive projections of the second roll, thereby enabling a homogeneous distribution of pressure to the material.
  • first roll and the second roll comprise a surface, the surface comprising any one of a list comprising steel, metal, hard metal, ceramic.
  • the surface further comprises a protective layer.
  • At least one of the lateral oblique surfaces comprises shading structure means for producing through an intended embossing of the material an optical shading effect when light is projected on the embossed material.
  • the shading structure means comprise pixelizing embossing structures.
  • the first roll is motor roll and the pair of rolls is configured such that the motor roll drives the second roll.
  • first roll and the second roll are synchronized by means of synchronization means.
  • the synchronization means comprise the positive projections and negative projections of the first roll and the second roll, the positive projections and the negative projections cooperating to synchronize a rotation of the first roll and the second roll during the operation of the rolls.
  • figure 1a represents an embossing structure for an embossing roll according to prior art
  • figure 1 b schematically shows a sheet of paper being embossed using the embossing structure of figure 1a by means of a pairs of rolls according to prior art
  • figure 1c is a layout plan of projections corresponding to embossing structures from figure 1 a according to prior art
  • figure 2a represents an embossing structure for an embossing roll according to an example embodiment of the invention
  • figure 2b is a layout plan of projections corresponding to embossing structures from figure 2a;
  • figure 3 schematically illustrates how embossing structures from two rolls are intended to interact in view of embossing, according to an example embodiment of the invention
  • figure 4 illustrates an example embossing system for implementing the embossing with the embossing structure according to the invention
  • figure 5 schematically illustrates a positive projection and a negative projection from corresponding embossing rolls and allowable tolerances of manufacturing
  • FIG. 6 schematically illustrates an embossing pattern according to an example embodiment of the invention
  • FIGS 7-9 schematically illustrates the embossing pattern of figure 6, in which selected surfaces are covered by shading structure means according to example embodiments of the invention
  • figure 10 schematically illustrates an embossing pattern according to a preferred embodiment of the invention
  • FIGS. 11-18 contain schematic illustrations of embossing patterns according to preferred embodiments of the invention. Detailed description of preferred embodiments
  • Prior art patent publication DK131333 teaches a checkered and uniform embossing pattern such as the one shown in figure 1a.
  • This embossing pattern is intended for the embossing of textile products.
  • the embossing pattern comprises a plurality of positive projections and negative projections marked with P and N respectively.
  • the embossing pattern is for an embossing system which makes use of a pair of rolls, whereby the textile product is fed into a roll nip between the pair of rolls— the embossing system is not shown in figure 1 a.
  • the embossing pattern corresponds to a structured surface of one of the rolls, whereby positive projections P are elevated above a mean cylindrical surface of one of the rolls, and negative projections N are recesses reaching below the mean cylindrical surface.
  • the positive projections and negative projections P and N are identically shaped polyhedral strutures, whereby the positive projections P are symmetrically shaped relative to the negative projections N when considered from the mean surface.
  • An other one of the rolls (not shown in figure 1 a) comprises on its cylindrical surface a matching embossing pattern which is positionned such that at a time of operation for embossing, both embossing patterns interact like congruent structures to emboss the textile product such that each of the projections on each roll becomes surrounded on all sides by projections of the other roll.
  • the size of the projections is approximately 1 cm in any lateral direction as indicated by the double-arrow in figure 1 c.
  • the exact dimensions are irrelevant for the present explanation, it is here only intended to indicate an order of magnitude for the size of the projections in prior art.
  • relatively powerful motors are required to provide high drive forces at a relatively low speed range— at least compared to the area of paper or thin foil embossing.
  • FIG 1 b also relates to the embossing process of DK131333.
  • the embossing process of DK131333 involves partly the lateral oblique surfaces of the projections— the pressure contacts between the projections from each roll are point shaped— at P-P' on a positive projection Zi as represented in figure 1 b or at Q-Q' at a bottom of a negative projection adjacent to positive projection Z 2 , and thereby excerts a lateral embossing force on the surface of the textile product being embossed, the latter which is represented using a sectional view in form of a textured stripe that passes between positive projections Zi and Z 2 .
  • the positive projections Zi and Z 2 are mechanically produced and necessarilly have edges that fail to have a 0-radius, i.e., they are lightly curved. While such an embossing process and embossing pattern may be useful in the textile product industry, it is undesirable to have pressure points such as P-P' and Q-Q', in optical uses of in- nerliners.
  • Figure 1 c shows a layout plan of the projections corresponding to at least a part of embossing structures from figure 1a, including the positive projections P, the negative projections N and the hills H, whereby the latter are intended to leave parts of the textile products as non-embossed. If such embossing structures were adapted in size and used to emboss thin foil material or innerliner, the hills would not cause any improved optical reflection surface, and hence the brillance of the foils could not be improved.
  • the plurality of positive projections P are disposed with a first periodicity on a first grid in axial direction and a second periodicity on the first grid in circumferential direction on a first roll. It is under- tood that the layout in figure 1 c is that of the embossing pattern on the first roll from a pair that also comprises a second roll (not shown in figure 1 c). In figure 1c the first periodicity is the same as the second periodicity, i.e., approximately 1 projection per 2 cm.
  • the plurality of negative projections N are disposed with the first periodicity in axial direction and the second periodicity in circumferential direction on the first grid interwined with the positive projections P, in axial and circumferential directions respectively.
  • the configuration of the embossing pattern on the second roll comprises a plurality of positive positive projections and a plurality of negative projections which are disposed on a second grid complementary to the first grid, on the second roll.
  • This means that the periodicities in axial and circumferential directions are the same as on the first roll.
  • each of the positive projections and the negative projections except for projections located on edges of the first grid at extremities in an axial direction of the first roll, is surrounded on all sides by positive projections and negative projections on the second roll.
  • the positive projections P of the first roll together with alternating corresponding negative projections N on the second roll form during the operation of the rolls and in the roll nip, a first straight line y-y substantially parallel to the axial direction, represented in figure 1c. It should for the sake of understanding be imagined that during operation the positive projections P of the first roll are penetrated in negative projections N of the second roll (not represented in figure 1c).
  • the negative projections N of the first roll together with alternating corresponding positive projections P on the second roll form during the operation of the rolls and in the roll nip, a second straight line x-x substantially parallel to the axial direction. It should for the sake of understanding be imagined that during operation the negative projections N of the first roll are penetrated by positive projections P of the second roll (not represented in figure 1 c).
  • the embossing pattern according to the invention departs from the embossing pattern taught in DK131333.
  • the inventive embossing pattern does away with the hills in the embossing pattern as known from DK131333, as is illustrated in figure 2a, where an embossing pattern according to an example embodiment of the invention is shown.
  • the embossing pattern corresponds to a structured surface of one of the rolls, whereby the positive projections P are elevated above a mean cylindrical surface of one of the rolls (not referenced in figure 2a), and the negative projections N are recesses reaching below the mean cylindrical surface.
  • the positive projection P and the negative projections N are identically shaped polyhedral structures, whereby the positive projections P are symmetrically shaped relative to the negative projections N when considered from the mean surface.
  • An other one of the rolls (not shown in figure 1a) comprises on its cylindrical surface a matching embossing pattern which is positionned such that at a time of operation for embossing, both embossing patterns interact like congruent structures to emboss the product or material on both sides, such that each of the projections on each roll becomes surrounded on all sides by projections on the other roll.
  • Figure 2b shows a layout plan of projections corresponding to embossing structures from figure 2a, in fact only a part of the embossing pattern from figure 2a, comprising positive projections P and negative projections N.
  • a double arrow shows an order of magnitude for the structures in the embossing pattern, which lies around 100 ⁇ in any lateral direction. The exact dimensions are irrelevant for the present explanation, it is only intended to indicate an order of magnitude for the size of the projections in the invention.
  • embossing pattern of figure 2a and a corresponding inverse embossing pattern on respective rolls of a pair of embossing rolls, to emboss a foil or innerliner would confers a 100% embossing coverage of the embossed surface— in contrast to DK131333 where parts of the product corresponding to hills of the embossing pattern are not embossed.
  • Such embossing configuration is schematically illustrated in figure 3, where two facing embossing patterns from the pair of rolls are positioned such that the positive projections P from the one roll correspond to the negative projection N from the other roll and vice versa.
  • Figure 3 illustrates the facing embossing patterns at rest, when the rolls are separated by a distance h and a sheet of material (not shown in figure 3) may be inserted in the roll nip, i.e., in the gap h.
  • the rolls are firstly driven towards each other, and the positive projections P penetrate in the negative projections N, thereby embossing a sheet of material that would have been fed into the roll nip formed by the pair of rolls.
  • first straight line y-y and the second straight line x-x as defined for the prior art embossing structure in figure 1 c are coincident in a single third line z-z in the invention as shown in figure 2b, the main reason being that in the invention the embossing pattern does away with the hills as known from DK131333.
  • Figure 4 illustrates an example embodiment of an apparatus for embossing material on both sides according to the invention.
  • the apparatus comprises a pair of a first roll 40 and a second roll 41 , whereby the first roll 40 is driven by means of a drive mechanism 42, and transmits the drive force to the second roll 41 by means of toothed wheels 43, located at an extremity of each roll.
  • the type of drive mechanism 42 and structure of the toothed wheels 43 to transmit the drive force are exemplary only and may be varied while remaining in the scope of the present invention. It may for example be that no toothed wheels are used, and that the drive is realized by the interactions of the projections of both embossing rolls with each other (not shown in figure 4).
  • the material to be embossed on both of its sides (material not shown in figure 4), is intended to be inserted in roll nip 44.
  • the surfaces of the first roll 40 and the second roll 41 are equiped with embossing patterns as explained in the present description, as for example the embodiment shown in figure 2a for one roll, and a corresponding opposite structure for the other roll.
  • the inventive embossing pattern it is possible to obtain a homogeneous distribution of pressure to the material, i.e., a regular and homogenous balance between the pressure on the lateral oblique surfaces of the positive projections P and negative projections N, mitigated perhaps only by variations of the material thickness that occur over a certain range of tolerances. Furthermore, axial contraction of the embossed foil is reduced and a smoother surface is obtained compared to the older embossing technologies of the Applicant.
  • the embossing pattern and the shape of the positive projections and negative projections comprised therein may be configured such to restaure the full theoretical intensity of reflexion of a metalized sheet, after embossing.
  • the negative projections and positive projections in such a manner that an attenuation of reflection may be achieved.
  • the embossing pattern according to the invention is for use in fine embossing.
  • Fine embossing may be defined by mechanical tolerances that are applicable to the manufacture of the fine embossing structures on the rolls, i.e., to positive and negative projections. More precisely, in case of fine embossing, the outline of the embossing structures on the rolls may have a total linear mistake in axial or radial direction of less than +/- 7 ⁇ and/or a radial angle mistake of less than 0,4°.
  • the tolerances for fine embossing structures are applicable for example to the manufacture of positive projection structures P and negative projection structures N of the embossing configuration shown in figure 3.
  • the strict tolerances can be understood to be the result of an improved quality at the manufacture of the rolls.
  • the tolerance may be dependent from the quality of surfaces of the rolls. It is therefore an advantage to use relatively hard material for the surface.
  • the tolerances at manufacture may be attained for rolls made of metal or hard metal, with a surface made of hard metal.
  • An other example of suitable material combination includes a roll made of ceramic material or metal, and covered with a ceramic surface.
  • the material indicated for the example rolls are particularly adapted for manufacture in the area of tolerances for fine embossing. The manufacture of such materials typically requires short pulsed lasers. It is usually advantageous to cover the surface of the embossing rolls with a suitable protective layer.
  • a roll having a length of 150 mm— thus measured in axial direction— and a diameter of 70 mm will show positioning errors for the projections which may deviate from the desired position by
  • a height of a positive projection or depth of negative projection is in the order of 0,1 mm and this height has a tolerance of +/- 5 ⁇ .
  • a tolerance of +/- 5 ⁇ For an angle of two oblique lateral surfaces that are adjacent, 1 from a positive projection and the other from a negative projection on the counter roller, of for example 80°, it is desired to achieve a tolerance of less than 5°.
  • this represents a positive projection penetrated in a negative projection, wherein the angle must be given with a tolerance of less than 5° and the linear error affecting the distance 51 between the positive projection and the negative projection's walls must be determined with a maximum deviation of +/- 7 ⁇ .
  • any mechanical or laser manufacturing fails to produce absolutely plain walls when working on steel because of the natural properties of steel. This of course makes is difficult to determine angles between walls.
  • the total linear difference for the embossing of a foil with 30 ⁇ thickness will be around 40 ⁇ , but for the embossing of a foil with, e.g., 300 ⁇ thickness, it will be around 120 ⁇ relative to an axial embossing length of 150 mm.
  • the embossing pattern according to the invention may— in at least a preferred embodiment— be configured to enable the embossing of additional shading structures intended for producing an optical shading effect when light is projected on the embossed material.
  • additional shading structures intended for producing an optical shading effect when light is projected on the embossed material.
  • such configuration involves providing at least a lateral surface of a positive and/or a negative projection, on at least one of the rolls in the pair of rolls, with shading structures.
  • Shading structures have been provided as scratches on material's surfaces in prior art, for example when rendering surfaces of gold wrist- watches bodies matt.
  • thin films or foil materials such as used to make package innerliners, for example, it was to date only possible to produce shading effects by grading or deforming the pyramids— see for example EP 0 925 911 and EP 1 324 877.
  • pixelization involves making on the surfaces of the thin films or foil materials a relatively large number of densely packed and randomly arranged pixels, which have individual heights of for example 10 ⁇ from the embossing surface. This enables to prevent any direct reflexion of light projected on the surface rather than having the surface acting as a mirror. Light projected on the thus modified surface may even be absorbed depending on the size of the pixelization. Hence this allows to make very fine gradings that produce pleasing esthetical effects.
  • the shading structures fit on the lateral surfaces of the positive and negative projections without impeding the process of fine embossing.
  • the shading structures may also be made on surfaces of the projections, wherein theses surfaces are created by the flattening.
  • Figures 6 to 9 contain examples of a same embossing pattern, which according to preferred embodiments exhibit shading structures on lateral surfaces or flattened top and/or bottom surfaces of the projections.
  • Figure 6 schematically illustrates in a 3-dimensional view an embossing pattern according to the invention without any shading structure means on any surface.
  • the embossing pattern comprises positive projections P with flattened tops, and negative projections N with flattened bottoms.
  • the square at the right of figure 6 represents a map of the embossing pattern as seen from above.
  • Figure 7 schematically illustrates a similar embossing pattern as in figure 6, in which a part of the surfaces of positive projections P, more specifically their flattened top surfaces comprise shading structure means represented as cube shaped asperities affixed to the flattened surface in a regular distances from each other.
  • the cube shape is for illustration only and may be varied according to the actual needs.
  • the square at the right of figure 7 represents a map of the embossing pattern as seen from above, wherein the textured portions correspond to surfaces of the embossing pattern that comprise shading structures, and the non-textured portions to surfaces that don't comprise any shading structures.
  • Figure 8 schematically illustrates a configuration in which, partly similar as in figure 7, a part of the lateral surfaces of positive projections P but also of negative projections N comprise shading structure means.
  • the flattened bottom surfaces from the negative projections N specifically comprise such shading structures, while the flattened top surface of the positive projections don't.
  • the square at the right of figure 8 represents a map of the embossing pattern as seen from above, wherein the textured portions correspond to surfaces of the embossing pattern that comprise shading structures, and the non-textured portions to surfaces that don't comprise any shading structures.
  • Figure 9 schematically illustrates a further configuration in which all surfaces except the flattened top surface of the positive projections P and the flattened bottom surfaces of the negative projections N, carry shading structures— the surfaces without shading are represented in plain white.
  • the square at the right of figure 9 represents a map of the embossing pattern as seen from above, wherein the textured portions correspond to surfaces of the embossing pattern that comprise shading structures, and the non-textured portions to surfaces that don't comprise any shading structures.
  • Figure 10 illustrates an example embodiment of an embossing pattern in a view from above, in a very schematic manner in order to show the principle only, to be realized on one roll of the pair of rolls according to the invention.
  • a corresponding embossing pattern must be realised for the other one of the pair of rolls (not represented in figure 10).
  • a plurality of positive projections represented by the darker rectangles and a plurality of negative projections represented by the lighter rectangles are respectively disposed. Since the positive projections and the negative projections are identical polyhedral shapes, they have the same length, width and height.
  • the positive projections are oriented lengthwize perpendicular to the lengthwise direction of the negative projections, and are aligned in axial direction, but also in circumferential direction.
  • the length direction of the negative projections is oriented parallel to the axial direction, while the length direction of the positive projection is oriented parallel to the circumferential direction.
  • a first periodicity of the negative projections in axial direction is the same as a periodicity of the positive projections in axial direction.
  • a second periodicity of the negative projections in circumferential direction is the same as a periodicity of the positive projections in circumferential direction.
  • the first periodicity and the second periodicity directly depend on the length and width values of the negative and positive projection, but needn't be the same.
  • the negative projections are aligned with the positive projections in axial direction such that the projection structures are adjacent. Similarly the negative projections are aligned with the positive projections in circumferential direction such that the projection structures are adjacent.
  • the negative and positive projections in axial direction, from one line to the next adjacent line, are offset by 1/2 period distance.
  • Figure 1 1 shows a further example embodiment of an embossing pattern in a view from above, to be realized on one of the pair of rolls according to the invention.
  • the embossing pattern comprises wedges in positive projections and negative projections, whereby the apex of the wedge is a straight segment, and the apex of positive projection wedges is perpendicular to the apex of negative projection wedges— the bottom of the projection.
  • the negative projections and the positive projections are identical shaped polyhedral structures.
  • the surfaces shown in different textures, except for the squares, represent surfaces that are in an angle to each other and also to the plane of the figure.
  • two successive projections on an axial line i.e., a negative projection and its adjacent positive projection
  • the two projections adjacent on a same side in circumferential direction all 4 together form a square surface that is flat and at the level of the mean surface of the roll.
  • the flat square surface will not produce any embossing of material at the time of embossing.
  • Figure 12 shows the embossing pattern of figure 1 1 as viewed from an angle to obtain a 3 dimentional illustration, intended to complete the understanding of figure 1 1.
  • Figure 13 shows a further example embodiment of an embossing pattern in a view from above, and containing positive projections, the lateral sides of which are triangular surfaces, and negative projections having the same shape but inverted. Dark textured surfaces represent positive projections while lighter textured surfaces represent negative projections.
  • Figure 14 illustrates a further example embodiment of an embossing patter in a view from above made of tetrahedrons.
  • the surfaces shown in different textures represent surface that are in an angle to each other and also to the plane of the figure.
  • Figure 15 shows the embossing pattern of figure 14 as viewed from an angle to obtain a 3-dimentional illustration, intended to complete the understanding of figure 14.
  • Figure 16 illustrates a further embodiment of an embossing pattern in which the outline of the base of either one of the positive projections and the negative projections is a square. Dark textured surfaces represent positive projections while lighter textured surfaces represent negative projections.
  • Figure 17 illustrates a further embodiment of an embossing pattern in which the outline of the base of either one of the positive projections and the negative projections is a rectangle. Dark textured surfaces represent positive projections while lighter textured surfaces represent negative projections.
  • Figure 18 illustrates a further embodiment of an embossing pattern in which the outline of the base of either one of the positive projections and the negative projections is a rhomboid. Dark textured surfaces represent positive projections while lighter textured surfaces represent negative projections.

Abstract

L'invention concerne un procédé de gaufrage permettant de gaufrer un matériau des deux côtés, comprenant l'introduction du matériau en feuille dans une ligne de contact de rouleaux entre une paire d'un premier rouleau et d'un second rouleau, la fourniture sur le premier rouleau et sur le second rouleau d'une pluralité de saillies positives et d'une pluralité de saillies négatives de structures polyédriques de forme identique, un premier sous-ensemble de la pluralité de saillies positives étant disposé selon un premier intervalle sur une première grille dans une direction axiale et selon un second intervalle sur la première grille dans une direction circonférentielle sur le premier rouleau, et un second sous-ensemble de la pluralité de saillies négatives étant disposé selon la premier intervalle dans la direction axiale et selon le second intervalle dans la direction circonférentielle sur la première grille imbriquées dans les saillies positives, dans des directions axiale et circonférentielle respectivement, et des saillies complémentaires de la première grille, sur le second rouleau. Les saillies positives et les saillies négatives sur le premier rouleau pendant le fonctionnement des rouleaux et dans la ligne de contact de rouleaux sont entourées de tous côtés par des saillies positives et des saillies négatives sur le second rouleau, les saillies positives du premier rouleau conjointement avec des saillies négatives correspondantes alternées sur le second rouleau formant pendant le fonctionnement des rouleaux et dans la ligne de contact de rouleaux, une première ligne droite sensiblement parallèle à la direction axiale, et les saillies négatives du premier rouleau conjointement avec des saillies positives correspondantes alternées sur le second rouleau formant pendant le fonctionnement des rouleaux et dans la ligne de contact de rouleaux, une seconde ligne droite sensiblement parallèle à la direction axiale. Les saillies positives et les saillies négatives sont telles que, dans la direction axiale sur le premier rouleau, chaque saillie positive partage une bordure de base latérale avec au moins une saillie négative adjacente à la saillie positive, et pendant le fonctionnement des rouleaux et dans la ligne de contact de rouleaux, toutes les surfaces obliques latérales des saillies positives et négatives du premier rouleau sont juste au-dessus de la surface, en regard des surfaces obliques latérales correspondantes des saillies négatives et positives respectives du second rouleau, ce qui permet une répartition homogène de la pression sur le matériau.
PCT/IB2017/058121 2016-12-20 2017-12-19 Procédé et structure de gaufrage destinés à augmenter au maximum l'accumulation de pression lors du gaufrage rotatif de feuilles WO2018116156A1 (fr)

Priority Applications (6)

Application Number Priority Date Filing Date Title
CN201780086176.5A CN110290918B (zh) 2016-12-20 2017-12-19 用于在箔片的旋转压印过程中使压力积聚最大化的方法和压印结构
PL17826310T PL3558659T3 (pl) 2016-12-20 2017-12-19 Sposób i struktura do wytłaczania przeznaczona do maksymilizacji wzrostu nacisku przy wytłaczaniu rotacyjnym folii
BR112019012566-3A BR112019012566B1 (pt) 2016-12-20 2017-12-19 Método e aparelho de estampagem para estampar um material em ambos os lados
US16/470,624 US11453190B2 (en) 2016-12-20 2017-12-19 Method and embossing structure for maximizing pressure buildup at rotational embossing of foils
RU2019121658A RU2746061C2 (ru) 2016-12-20 2017-12-19 Способ тиснения и тиснительная структура для максимизации роста давления при ротационном тиснении фольги
EP17826310.9A EP3558659B1 (fr) 2016-12-20 2017-12-19 Procédé et structure de gaufrage pour maximiser l'accumulation de pression au niveau du gaufrage tournant de feuilles

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EP16205224.5A EP3339012A1 (fr) 2016-12-20 2016-12-20 Procédé et structure de gaufrage pour maximiser l'accumulation de pression au niveau du gaufrage tournant de feuilles

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CN110290918B (zh) 2021-02-05
RU2746061C2 (ru) 2021-04-06
RU2019121658A3 (fr) 2021-01-25
US20200086600A1 (en) 2020-03-19
EP3558659B1 (fr) 2021-02-03
PL3558659T3 (pl) 2021-11-15
EP3558659A1 (fr) 2019-10-30
BR112019012566A2 (pt) 2019-11-19
CN110290918A (zh) 2019-09-27
PT3558659T (pt) 2021-05-05
US11453190B2 (en) 2022-09-27
BR112019012566B1 (pt) 2023-02-14
EP3339012A1 (fr) 2018-06-27
RU2019121658A (ru) 2021-01-22

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